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Full Discussion: EOF not found
Top Forums Programming EOF not found Post 302259128 by Corona688 on Monday 17th of November 2008 10:21:04 AM
Old 11-17-2008
I now see that getline returns a value, which may be why it doesn't throw an exception on all systems -- it can't do both at the same time, the implementor had to pick one in the event of failure. As for why EOF doesn't occur after a failed getline, I can only guess how Sun implemented their iostream. It certainly looks like it ought to produce EOF under those circumstances. So I guess you'll just need to check all return values for errors to be compatible with both. Which is probably a good idea anyway...

so your usual while loop, and with the getline, you do this:

Code:
try{
if(getline(file, buffer) <= 0)
  break;
}

which will cause the loop to break when getline fails as well as checking for exceptions.
Last edited by Corona688; 11-17-2008 at 11:33 AM..
 

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LEARN ABOUT CENTOS

zzip_entry_fopen

ZZIP_ENTRY_FOPEN(3)					       zziplib Function List					       ZZIP_ENTRY_FOPEN(3)

NAME

       zzip_entry_fopen, zzip_entry_ffile, zzip_entry_fread, zzip_entry_fclose, zzip_entry_feof - open a file within a zip disk for reading

SYNOPSIS

       #include <zzip/fseeko.h>

       zzip__new__ ZZIP_ENTRY_FILE * zzip_entry_fopen((ZZIP_ENTRY * entry, int takeover));

       zzip__new__ ZZIP_ENTRY_FILE * zzip_entry_ffile((FILE * disk, char *filename));

       zzip_size_t zzip_entry_fread((void *ptr, zzip_size_t sized, zzip_size_t nmemb, ZZIP_ENTRY_FILE * file));

       int zzip_entry_fclose((ZZIP_ENTRY_FILE * file));

       int zzip_entry_feof((ZZIP_ENTRY_FILE * file));

DESCRIPTION

       The zzip_entry_fopen function does take an "entry" argument and copies it (or just takes it over as owner) to a new ZZIP_ENTRY_FILE handle
       structure. That structure contains also a zlib buffer for decoding. The zzip_entry_fopen function does seek to the file_header of the given
       "entry" and validates it for the data buffer following it. We do also prefetch some data from the data buffer thereby trying to match the
       disk pagesize for faster access later. The zzip_entry_fread will then read in chunks of pagesizes which is the size of the internal
       readahead buffer. If an error occurs then null is returned.

       The zzip_entry_ffile function opens a file found by name, so it does a search into the zip central directory with zzip_entry_findfile and
       whatever is found first is given to zzip_entry_fopen

       The zzip_entry_fread function reads more bytes into the output buffer specified as arguments. The return value is null on eof or error, the
       stdio-like interface can not distinguish between these so you need to check with zzip_entry_feof for the difference.

       The zzip_entry_fclose function releases any zlib decoder info needed for decompression and dumps the ZZIP_ENTRY_FILE struct then.

       The zzip_entry_feof function allows to distinguish an error from an eof condition. Actually, if we found an error but we did already reach
       eof then we just keep on saying that it was an eof, so the app can just continue.

AUTHOR

       o   Guido Draheim <guidod@gmx.de>

COPYRIGHT

       Copyright (c) 2003,2004 Guido Draheim All rights reserved, use under the restrictions of the Lesser GNU General Public License or
       alternatively the restrictions of the Mozilla Public License 1.1

zziplib 							      0.13.62						       ZZIP_ENTRY_FOPEN(3)
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